soulcutter

class SpeedLimit
  def initialize(enumerator)
    @enumerator = enumerator.to_enum
  end

  def at(count, per:)
    increment_seconds = case per
      when :second then 1.0 / count.to_f
      when :minute then 60.0 / count.to_f
      when :hour then 3600.0 / count.to_f

soulcutter

def level_descriptions=(input)
  write_attribute(:levels_description, input).tap do |_result|
    flush_cache :levels_description
  end
end

# same number of lines, one less method call, one less block, but pretty much the same as
# far as I'm concerned.
def level_descriptions=(input)
  result = write_attribute(:levels_description, input)

soulcutter

module Memo
  def memoize(method_name)
    original_method = instance_method(method_name)
    method_cache = Hash.new { |h, k| h[k] = {} }
    define_method(method_name) do |*args, &block|
      if method_cache[self].key?([args, block])
        method_cache[self][[args, block]]
      else
        method_cache[self][[args, block]] = original_method.bind(self).call(*args, &block)
      end

soulcutter

module Instrumenter
  class Instrumentation < Module
    def initialize(method, label)
      @method = method
      @label = label

      define_method(method) do |*args|
        start_time = Time.now
        super(*args).tap do
          end_time = Time.now

soulcutter

bathroom.urinals.occupied.select { |urinal| urinal.adjacent.select(&:occupied?).any? }

 Urinal = Struct.new(:is_occupied, :location) { def adjacent_urinals; location.adjacent_urinals; end }

soulcutter

require "delegate"

Foo = Class.new(SimpleDelegator)
Bar = Struct.new(:foo)

Foo.new(1) == Foo.new(1) # => true

Bar.new(1) == Bar.new(1) # => true
Foo.new(Bar.new(1)) == Foo.new(Bar.new(1)) # => false

soulcutter

# frozen_string_literal: true

require "delegate"
require "set"

# Hash that can only hold a certain number of keys, keys expire on a LRU basis
class BoundedHash < DelegateClass(Hash)

  NO_OP = proc {}

soulcutter

RSpec::Matchers.define :be_uniq do
  match do |actual|
    values_match? actual.uniq, actual
  end

  failure_message do |actual|
    diff = actual.dup
    actual.uniq.each { |value| diff.delete_at diff.index(value) }
    diff = diff.uniq
    "expected that #{actual.inspect} to be uniq, but found the following repeated elements: #{diff.inspect}"

soulcutter

module Fluent
  def fluent_accessor(*attr_names)
    attr_names.each do |attr_name|
      define_method attr_name do |*val|
        return instance_variable_get("@#{attr_name}") if val.empty?
        raise ArgumentError, "Expected 0..1 arguments, got #{val.size}" if val.size > 1

        value = val.first
        value = yield(value) if block_given?
        

soulcutter

ternary = foo ? !bar : bar
xor = !!(foo ^ bar)
neq = foo != bar

foo   | bar   | xor   | ternary | neq 
-------------------------------------
true  | true  | false | false   | false
false | false | false | false   | false
true  | false | true  | true    | true
false | true  | true  | true    | true